From a0b7ecbfe0d2ed974a68892cf8111a45ab24cd0f Mon Sep 17 00:00:00 2001
From: jdl <jdl@crumpington.com>
Date: Mon, 15 Sep 2025 21:15:05 +0200
Subject: [PATCH] Fix syn-ack bug

---
 peer/remotefsm.go | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/peer/remotefsm.go b/peer/remotefsm.go
index 6ea3e16..14d9261 100644
--- a/peer/remotefsm.go
+++ b/peer/remotefsm.go
@@ -163,24 +163,21 @@ func (r *remoteFSM) stateServer_onSyn(msg controlMsg[packetSyn]) {
 	r.lastSeen = time.Now()
 	p := msg.Packet
 
-	if p.TraceID == r.traceID {
-		return
-	}
-
-	r.traceID = p.TraceID
-
-	// Before we can respond to this packet, we need to make sure the
-	// route is setup properly.
 	conf := r.conf()
 
-	conf.Up = true
-	conf.Direct = p.Direct
-	conf.DirectAddr = msg.SrcAddr
+	// New trace ID => Update the route configuration.
+	if p.TraceID != r.traceID {
+		r.traceID = p.TraceID
 
-	conf.DataCipher = newDataCipherFromKey(p.SharedKey)
+		conf.Up = true
+		conf.Direct = p.Direct
+		conf.DirectAddr = msg.SrcAddr
 
-	r.updateConf(conf)
-	r.logf("Got SYN.")
+		conf.DataCipher = newDataCipherFromKey(p.SharedKey)
+
+		r.updateConf(conf)
+		r.logf("Got SYN.")
+	}
 
 	r.sendControl(conf, packetAck{
 		TraceID:       p.TraceID,